Guitar Pre Amp Using TL072

The preamp circuit is shown in the figure has a few interesting characteristics that separate it from the "normal" assuming that there is such a thing. The circuit is built by TL072 as amp. This is simple design and provides excellent tonal range. The gain structure is designed to provide a huge amount of gain, which is ideal for those guitarists who like to get that fully distorted "fat" sound. This is the figure of the circuit.


The preamp uses a dual op amp as its only amplification. The lone transistor is an emitter follower, and maintains low output impedance after the master volume control. As shown in the figure, with a typical guitar input, it is possible to get a very fat overdrive sound by winding up the volume, and then setting the master for a suitable level. The overall frequency response is deliberately limited to prevent extreme low-end waffle, and to cut the extreme highs to help reduce noise and to limit the response to the normal requirements for guitar. If you use the TL072 op amp as shown, you may find that noise is a problem, especially at high gain with lots of treble boost. I strongly suggest that you use an OPA2134 a premium audio op, you will then find this quite possibly the quietest guitar amp you have ever heard. At any gain setting, there is more pickup noise from the guitar than circuit noise and for the prototype pre amp used carbon resistors.

BMW R Motorcycle Regulator Circuit

This is a design circuit for motorcycle regulator. This circuit is controlled by transistor. This is he figure of the circuit.


Correctly adjusted, the voltage on the pot wiper is slightly less than half D+ (appx. 0.47*D+) and Q1 will conduct if (D+)-(Vp)>6.2+0.7+0.7, or 0.53*(D+) > 7.6V, (D+) > 14.3V. If D+ is lower than 13.7V, Q1 will not conduct, Q2 will get driven via R5, and Q3 will conduct. Df will carry a voltage. When D+ rises, Q1 will start conducting, Q2 will get pinched gradually, and so will Q3. Voltage on Df will drop.

Part:
R1 330
R2 270
R3 470
R4 1.5K
R5 1.2K
R6 100
P 100 ohm pot
C1, C2, C3 100nF ceramic
Q1,Q2 BC327
Q3 BD244A
D1 1N4148
D2 BZX6V2 zener, 6.2V
D3 1N4003

D4 no markings, but a 10A, 50V schottky should do the job here. Strangely enough, the diodes in my Siemens databooks that use this package go up to about 3A, which I consider a little low for this application (BY245, BY246).